No recommendations for a Spanish lawyer, I'm afraid - in my experience, they're all pretty useless (although I've only used ones in Murcia and Andalucia, perhaps ones in Barcelona and Madrid are of a higher standard) although I do think they are limited by what they can do to some extent, due to the Spanish legal/court system - however many of them seem to use that as an excuse to sit on their a** month after month, without even bothering to update you by email, even if there's nothing to tell.
If it were me, I would lobby my MEP and try to contact as many people who are in the same or similar boat as myself - there are quite a few lobbyist groups, try an internet search to see what comes up - Spanish property scandal petition is run by a very energetic woman by the name of Suzanne, I believe.
You probably won't get your money back sooner, but at least you will be doing something constructive, and forcing the EU to actually start hitting Spain where it hurts - their pockets.
I wish everyone the best of luck with this - I would also suggest that some (no one on this particular thread) come to their senses and realise that Huma is not interested in doing what is morally right, i.e. giving back the money that they have effectively stolen.